2/29/2024 0 Comments 512 tuning fork uses![]() In this case, that parameter is whether air conduction (AC) is better than bone conduction (BC). Positive or negative in this case means that a certain parameter that was evaluated was present or not. Note that the words positive and negative are used in a somewhat confusing fashion here, as compared to their typical use in medical tests. In an ear with conductive hearing loss, bone conduction (BC) is better than air conduction (AC) In an ear with normal hearing and an ear with sensorineural hearing loss, air conduction (AC) is more than bone conduction (BC) bone conductive hearing loss Īir conduction uses the apparatus of the middle ear ( pinna, eardrum and ossicles) to amplify and direct the sound to the cochlea, whereas bone conduction bypasses some or all of these and allows the sound to be transmitted directly to the inner ear albeit at a reduced volume, or via the bones of the skull to the opposite ear. It is caused by the fact that even though one ear is unable to respond to the test, the other ear can still be stimulated by the bone conduction test (via conducting sound through skull bones to the opposite ear), causing the patient to respond to the tuning fork on mastoid but not when it's placed near the affected ear's air canal.
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